Tutorial_6_HW_Sustainable.doc - Tutorial 6 Hazardous Waste...

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Tutorial 6 Hazardous Waste & Sustainable 1. Explain what is solidification/stabilization technology and discuss its advantages and disadvantages. Solidification and stabilization were originally developed as process to treat industrial, hazardous and certain radioactive wastes. The objective is not to transform or destroy wastes but rather to contain and minimize the release of wastes into the environment, as well as detoxifying waste and limiting its mobility while improving its material properties such as increasing it structural strength and decreasing its compressibility and permeability. - Wastes: radioactive, heavy metals, ash residues, highly toxic sludges, oily sludges, contaminated oils, complex mixtures. - Stabilization is most effective when applied to inorganic contaminants. - Strictly, stabilization is a fixation process that converts the contaminants to an insoluble form by means of binding additives. Refer to 6A, 6B, 6C in lecture note 2. Outline advantages and disadvantages of pyrolysis. Pyrolysis is thermal decomposition at the absence of oxygen (very low content). Temperature for pyrolysis is lower (300-550°C) compared to incineration >1000°C. Limited performance data are available for systems treating hazardous wastes containing polychlorinated biphenyls (PCBs), dioxins, and other organics. There is a concern that systems that destroy chlorinated organic molecules by heat have the potential to create products of incomplete combustion, including dioxins and furans. These compounds are extremely toxic in the parts per trillion range. The process reportedly does not produce dioxins and furans.
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  • Spring '16
  • Pollution, Hazardous waste, Waste, hazardous wastes, certain radioactive wastes

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